JP2022039321A - Pressure reduction valve device - Google Patents

Abstract

To provide a pressure reduction valve device capable of excellently reducing pressure of high-viscosity fluid, and further enabling miniaturization.SOLUTION: A pressure reduction valve device 21 comprising an air pressure supply path 30 that supplies air pressure for operating a valve body 25b of a valve 25 that opens and closes a flow path in a direction away from a valve seat 25a, is provided with an air pressure increasing mechanism that increases air pressure urged in a direction of opening the valve 25 by amplifying a load generated in an air piston 32 moved by the air pressure supplied from the air pressure supply path 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pressure reducing valve device that reduces the pressure of the inflowing fluid and discharges the pressure, and particularly relates to a pressure reducing valve device suitable for reducing the pressure of a highly viscous material.

First, a conventional pressure reducing valve device of this type will be described with reference to FIG.

In FIG. 5, the conventional pressure reducing valve device 1 includes a fluid introduction path 3 and a fluid discharge path 4 in the lower part of the housing 2, and the fluid introduction path 3 and the fluid discharge path 4 are horizontally spaced apart from each other. Are arranged.

The fluid introduction path 3 has a front end portion 3a located in the inner part of the housing 2 having a small diameter, and a valve 5 having an opening 6 formed in the center below the tip of the front end portion 3a. The seat 5a is attached. The valve seat 5a is provided with a valve body 5b that abuts on the valve seat 5a and inhibits the discharge of the fluid from the front end portion 3a while being supported by the annular support member 8.

Above the housing 2, an upper housing 9 having an air supply port 10 for supplying air used for decompression control downward is formed in the center of the upper portion, and is arranged so as to be fitted and supported by the housing 2. There is.

A cylinder 11 communicating with the air supply port 10 is formed in the upper housing 9, and an air piston 12 that moves up and down in the cylinder 11 is sealed by an annular packing 13. On the lower surface of the central portion of the air piston 12, a load transmission member 14 that supports the air piston 12 from below and transmits the air pressure due to the air supplied to the air supply port 10 downward is provided. A receiving seat 15 is formed in the load transmitting member 14, and a downward conical concave portion 16 is formed in the central portion of the receiving seat 15.

In the recess 16, a plunger 17 having a conical shape whose upper end is fitted to the recess 16 is arranged so as to be movable up and down. The plunger 17 is connected to the annular support member 8, and when air is supplied from the air supply port 10, the air piston 12 and the load transmission member 14 are lowered, and the valve seat 5a of the valve 5 is used. The valve body 5b is separated, and the fluid from the fluid introduction path 3 is introduced into the housing 2 from the front end portion 3a of the fluid introduction path 3.

A communication passage 18 communicating with the fluid discharge passage 4 is formed in the housing 2, and the fluid from the fluid introduction passage 3 is discharged from the fluid discharge passage 4 to the outside through the communication passage 18. It is supposed to be done.

In such a conventional pressure reducing valve device 1, the air pressure due to the air supplied from the air supply port 10 above the air piston 12 is converted into a load by the area of the pressure receiving surface of the air piston 12, and the load is large. The valve 5 can be opened by separating the valve body 5b from the valve seat 5a against the fluid pressure from the fluid introduction path 3 that presses the plunger 17. On the contrary, if the load generated by the fluid pressure in the housing 2 that presses the plunger 17 from below is larger than the load generated by the air pressure supplied from the air supply port 10, the valve body 5b presses against the valve seat 5a. This will block the flow of fluid from the fluid introduction path 3.

The details of the operation of the pressure reducing valve device 1 described above will be described with reference to FIG.
P ₁ : Primary pressure (supply pressure)
P ₂ : Secondary pressure (discharge pressure)
As: _Pressure detection area: Area of valve seat 5a (outer diameter: d)
_App : Sheet area: Bottom area of plunger 17 (outer diameter: D)
W ₁ : Load of fluid introduction path 3 W ₂ : Assuming that the load is generated in the plunger 17, when the valve 5 is open, only the hydraulic pressure received by the area As _acts on the valve seat 5a, but the valve. When 5 is closed, the pressure P1 supplied from the fluid introduction path ₃ acts in the direction of opening the valve 5, so that the valve 5 must be closed unless the hydraulic pressure P2 on the discharge _side exceeds a certain pressure. Can't. That is, the condition that the valve 5 can be closed is W ₁ ≤ W ₂ , and at least P ₂ = As · _{P 1} / A _{p + As} .

Then, in order to reduce the influence of the primary pressure _{P 1} , it is necessary to make the ratio of the sheet area _Ap and the pressure detection area As as large as possible.

By the way, in a pressure reducing valve device that depressurizes _a low-pressure fluid of ₁ MPa or less, the pressure receiving area of the plunger, which is the pressure receiving portion, is increased in order to make the ratio between the seat area _Ap and the pressure detection area As as large as possible. However, since the hydraulic pressure is low, it does not become a large load, but for example, in a pressure reducing valve device that depressurizes _a high-pressure liquid of 10 MPa or more, if the pressure receiving portion is made large, the load required for control corresponds to the generated load. Also needs to be large. Therefore, it is necessary to increase the outer diameter of the plunger, which is the pressure receiving portion.

As described above, in the conventional pressure reducing valve device 1, in order to increase the generated load for control, it is necessary to provide a large-diameter air piston 12 and a plunger 17, which occupies a large space for installation and also has a heavy weight. There is a problem that the size becomes large and the strength of the holder that supports the pressure reducing valve device 1 is also required.

From these points of view, conversely, by making the area of the valve seat 5a of the valve ₅ as small as possible and increasing the ratio with the seat area _Ap , the generated load W2 is suppressed and the size is reduced as much as possible. board.

However, in such a conventional pressure reducing valve device 1, high pressure is used to compensate for a pressure loss when a large-capacity fluid of 10 liters or more per minute is flowed or a highly viscous fluid such as grease or a sealing material is flowed. When trying to increase the diameter of the valve seat 5a in the valve 5 in order to reduce the flow path resistance of the material transferred in the valve 5, the pressure from the supply side acting on the valve seat 5a causes the valve body 5b to move from the valve seat 5a. Since it acts in the direction of separation, it is necessary to generate a load for closing the valve 5 accurately against this pressure. Therefore, the diameter of the plunger 17 for pressure detection has to be increased, and the load received by the plunger 17 has increased.

_If the load received by the plunger 17 is controlled by an air pressure of about 0.5 to 0.7 MPa, which is usually used in factories, the diameter of the air piston 12 is increased to increase the area, and the load generated by the air pressure is increased. Had to be increased. As a result, the diameter of the air piston 12 has increased, and it has been necessary to increase the diameter and strengthen the support structure as described above.

For this reason, a pressure reducing valve device that has been made smaller and lighter has been conventionally known.

As an example, a valve body that can be moved up and down inside the valve box, a cylinder device that works with the valve body, and a lower corrugated cardboard screw that screws the cylinder device's piston at the lower end are formed, and a lower corrugated cardboard screw is formed at the upper end. A transmission shaft that forms an upper corrugated cardboard screw part with a larger lead than the part, a weight that is screwed into the upper corrugated cardboard screw part of the transmission shaft and arranged so that it can move up and down, and one end is in the downstream flow path of the valve box. Some have a pilot conduit that communicates with the other end and communicates with the cylinder chamber of the cylinder device (see, for example, Patent Document 1).

As another example, a throttle device is provided in the primary side passage, and the main pressure chamber for introducing the secondary side pressure facing the first diaphragm and the first and first diaphragms are separated from each other in the pilot valve. In some cases, the sub-pressure chamber of No. 2 is formed so that the area of the second diaphragm is larger than the area of the first diaphragm to amplify the secondary pressure of the valve (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 5-119845 Japanese Unexamined Patent Publication No. 2005-202736

In the pressure reducing valve device of Patent Document 1 described above, the control pressure amplification mechanism includes a transmission shaft in which a weight and a piston connected to the valve rod are provided in the main body and a ball screw is formed to connect the weight and the piston. This is done by making the leads of the ball screws provided on the transmission shaft different, and a flow path connecting to the main body from the secondary side of the flow path is required.

Therefore, in order to control the high-pressure fluid, a large weight and a pilot flow path are required, and it is unclear whether the lead difference of the screw can be increased in addition to the weight.

Further, in the above-mentioned Patent Document 2, the control pressure amplification mechanism is performed by a pilot valve having two diaphragms provided separately from the main body. Therefore, a plurality of flow paths connecting the main body and the pilot valve are required. Therefore, for high-pressure fluid control, it is necessary to increase the size of at least one diaphragm and to form a plurality of flow paths.

Therefore, the pressure reducing valve devices of both Patent Documents 1 and 2 described above are both large in size, and there is a problem that the strength of the holder for supporting each pressure reducing valve device is also required.

An object of the present invention is to provide a pressure reducing valve device capable of overcoming the above-mentioned problems in each of the conventional pressure reducing valve devices, satisfactorily reducing the pressure of a highly viscous fluid, and reducing the size. ..

In order to solve the above-mentioned problems, the pressure reducing valve device of the present invention according to claim 1 is a pressure reducing valve device that supplies depressurized fluid having high viscosity, and valves a valve body of a valve that opens and closes a flow path. In a pressure reducing valve device provided with an air pressure supply path that supplies air pressure that operates in a direction away from the seat, the direction in which the load generated in the air piston moved by the air pressure supplied from the air pressure supply path is amplified and the valve is opened. It is characterized by providing an air pressure increasing mechanism for increasing the air pressure urging the air pressure. And, by having such a structure, the pressure of the highly viscous fluid can be surely lowered by a simple structure.

In the pressure reducing valve device of the present invention according to claim 2, the air pressure increasing mechanism brings one end of a link pivotally supported by a fixing member into contact with a reciprocating piston, and the intermediate portion of the link is the valve. It is characterized in that it abuts on a load transmitting member that transmits a load to the body and increases the load on the piston by the principle of leverage so as to transmit the load to the valve body. By having such a configuration, the intermediate portion of the link, which is the point of action of the principle of leverage, is pressed against the load transmitting member to increase the air pressure.

The pressure reducing valve device of the present invention according to claim 3 is characterized in that at least one of the above links is provided. By having such a configuration, if the principle of leverage is performed by a plurality of sets of links, the air pressure can be increased more stably.

In the pressure reducing valve device of the present invention according to claim 4, the piston rod having a smaller diameter than the piston and the piston rod having a larger diameter than the piston rod, in which the air pressure increasing mechanism is connected to and driven by the reciprocating piston. It has a hydraulic piston that presses the liquid filled in the closed space in conjunction with, and increases the load on the piston by the principle of Pascal and transmits it to the valve body via the hydraulic piston. It is characterized by doing so. Then, by having such a configuration, the liquid filled in the closed space is pressed, and the load on the piston is increased by the principle of Pascal and transmitted to the valve body, and the air pressure is applied. Can be stably increased.

According to the pressure reducing valve device of the present invention, the pressure of a highly viscous fluid can be reliably reduced by utilizing air pressure in spite of its small size and simple structure by the principle of leverage or the principle of Pascal.

Vertical sectional front view showing the first embodiment of the pressure reducing valve device according to the present invention. Right side view of FIG. Top view with a part of FIG. 1 omitted A front view of a vertical cross section showing a second embodiment of the pressure reducing valve device according to the present invention. Longitudinal front view showing an example of a conventional pressure reducing valve device Explanatory drawing which shows the state of pressure in the pressure reducing valve device of FIG.

1 to 3 show the first embodiment of the present invention, and the pressure reducing valve device 21 of the present embodiment includes a fluid introduction path 23 and a fluid discharge path 24 in the lower part of the housing 22. The fluid introduction path 23 and the fluid discharge path 24 are arranged at intervals in the horizontal direction.

The fluid introduction path 23 has a front end portion 23a located in the inner part of the housing 22 having a small diameter, and a valve 25 having an opening 26 formed in the center below the tip of the front end portion 23a. The seat 25a is attached. The valve seat 25a is provided with a valve body 25b that abuts on the valve seat 25a and inhibits the discharge of the fluid from the front end portion 23a while being supported by the annular support member 28.

Above the housing 22, an upper housing 29 having an air supply port 30 for supplying air used for decompression control downward is formed in the center of the upper portion, and is arranged so as to be fitted and supported by the housing 22. There is.

A cylinder 31 communicating with the air supply port 30 is formed in the upper housing 29, and an air piston 32 that moves up and down in the cylinder 31 is sealed by an annular packing 33 and arranged. A piston rod 32a having a small diameter is vertically installed at the center of the lower surface of the central portion of the air piston 32, and the air piston 32 and the piston rod 32a are supported from below at the lower end of the piston rod 32a. A load transmission member 34 for transmitting the air pressure due to the air supplied to the air supply port 30 downward is provided so as to project. A receiving seat 35 is formed in the load transmitting member 34, and a downward conical concave portion 36 is formed in the central portion of the receiving seat 35.

In the recess 36, a plunger 37 formed in a conical shape whose upper end is fitted to the recess 36 is disposed so as to be movable up and down. The plunger 37 is connected to the annular support member 28, and when air is supplied from the air supply port 30, the air piston 32 and the load transmission member 34 are lowered, and the valve body 25b is lowered from the valve seat 25a. Will be separated, and the fluid from the fluid introduction path 23 will be introduced into the housing 22 from the front end portion 23a of the fluid introduction path 23.

A communication passage 38 communicating with the fluid discharge passage 24 is formed in the housing 22, and the fluid from the fluid introduction passage 23 is discharged to the outside from the fluid discharge passage 24 via the communication passage 38. It is supposed to be done.

In the present embodiment, the two swingable links 39 and 39 are pivotally attached to the pins 40 and 40 in opposite directions to each other and project upward so that the two swingable links 39 and 39 are pivotally attached to the pins 40 and 40, respectively. It is arranged. Each of the pins 40 serves as a fulcrum in the principle of leverage.

A roller 41 that abuts on the lower surface of the air piston 32 is rotatably supported at the other end of each link 39. Each roller 41 is a point of emphasis in the principle of leverage.

Then, on the lower surface of the intermediate portion in the longitudinal direction of each link 39, there is a pin 42 forming an action point in the principle of leverage, and the pressing portion 42a is projected so as to abut on the upper surface of the load transmission member 34.

Therefore, when the air pressure of the air supplied from the air supply port 30 acts on the upper surface of the air piston 32, the air piston 32 is lowered by this air pressure, and as a result, each link 39 is in the horizontal direction about the pin 40. It is swung so as to approach. Then, the pin 42 of each link 39 presses the load transmission member 34. At this time, since the distance from the pin 42 pressing the load transmission member 34 to the pin 40 is smaller than the distance from each roller 41 to which the air piston 32 is in pressure contact to the pin 40 forming the fulcrum. According to the principle of leverage, the pressure at which the pin 42 of each link 39 presses the load transmitting member 34 is larger than the air pressure of the air supplied from the air supply port 30. For example, if the distance is 1/2, the load will be doubled. That is, the air pressure of the air supplied from the air supply port 30 is increased.

As described above, according to the present embodiment, the air pressure is stable despite the simple configuration in which the link 39 for forming the principle of leverage is interposed between the air piston 32 and the load transmission member 34. The viscous fluid can be satisfactorily depressurized.

The number of links for executing the principle of leverage is not limited to the two in the above-described embodiment, and may be one or three or more.

FIG. 4 shows a second embodiment of the pressure reducing valve device according to the present invention. The same members as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 4, the pressure reducing valve device 21A of the present embodiment has an air piston 32 that is lowered by the air pressure of the air supplied to the air supply port 30 of the upper housing 29, and the central portion of the lower surface of the air piston 32. A piston rod 32a is vertically installed in the.

A cylinder 44 is formed in the center of the lower portion of the upper housing 29, and a liquid piston 45 capable of moving up and down in the cylinder 44 is disposed in the cylinder 44.

A liquid storage recess 46 located below the piston rod 32a is formed between the upper housing 29 and the liquid piston 45 so as to cut out the upper housing 29 and the liquid piston 45, respectively. The recess 46 faces the piston rod 32a from below and has a cylindrical upper portion 46a having a diameter substantially the same as the outer diameter of the piston rod 32a. Below the cylindrical upper portion 46a, a truncated cone-shaped intermediate portion 46b is formed so as to communicate with the cylindrical upper portion 46a. A hanging portion 46c extending downward is formed at the edge of the intermediate portion 46b, and the lower end of the hanging portion 46c is made liquidtight by a sealing member 47 mounted on the outer periphery of the liquid piston 45. It is being held. A sealing member 48 for preventing the liquid from rising along the outer periphery of the piston rod 32a is arranged so as to face the piston rod 32a.

Further, below the intermediate portion 46b of the liquid storage recess 46, a cylindrical lower portion 46d of the liquid storage recess 46 is continuously provided. The inner diameter of the cylindrical lower portion 46d is formed to be slightly larger than the inner diameter of the cylindrical upper portion 46a. The outer diameter of the liquid piston 45 is about 2.4 times larger than the outer diameter of the piston rod 32a. Therefore, the air pressure applied to the piston rod 32a is amplified by a magnification of less than 6 times according to Pascal's principle.

An upward recess 45a is formed in the center of the lower end of the liquid piston 45. A conical top 37a formed at the upper end of the plunger 37 is fitted in the recess 45a.

According to the configuration of the second embodiment described above, the air pressure of the air supplied from the air supply port 30 of the upper housing 29 is amplified by the Pascal's principle by the ratio of the cross-sectional area of the piston rod 32a and the liquid piston 45 to be annular. Since it is transmitted to the support member 28, the air pressure can be stably increased and the viscous fluid can be satisfactorily depressurized.

The present invention is not limited to the above-described embodiment, and various modifications can be made.

1,21,21A Pressure reducing valve device 2,22 Housing 3,23 Fluid introduction path 4,24 Fluid discharge path 5,25 Valve 5a, 25a Valve seat 5b, 25b Valve body 8,28 Ring support member 9,29 Upper housing 10 , 30 Air supply port 11, 31 Cylinder 12, 32 Air piston 32a Piston rod 14, 34 Load transmission member 17, 37 Plunger 18, 38 Continuous passage 32a Piston rod
39 Link 40 pin 41 Roller 42 pin 42a Pressing part 44 Cylinder 45 Hydraulic piston 46 Liquid storage recess

By the way, in a pressure reducing valve device that depressurizes _a low-pressure fluid of ₁ MPa or less, the pressure receiving area of the plunger, which is the pressure receiving portion, is increased in order to make the ratio between the seat area _Ap and the pressure detection area As as large as possible. However, since the hydraulic pressure is low, it does not become a large load, but for example, in a pressure reducing valve device that depressurizes _a high-pressure liquid of 10 MPa or more, if the pressure receiving part is made large, the load required for control corresponds to the generated load. Also needs to be large. Therefore, it is necessary to increase the outer diameter of the plunger, which is the pressure receiving portion.

In order to solve the above-mentioned problems, the pressure reducing valve device of the present invention according to claim 1 is a pressure reducing valve device that supplies a pressure-reduced fluid having a high viscosity, and a valve body of a valve that opens and closes a flow path is valved. In a pressure reducing valve device provided with an air pressure supply path that supplies air pressure that operates in a direction away from the seat, the direction in which the valve is opened by increasing the load generated on the air piston moved by the air pressure supplied from the air pressure supply path. A load increasing mechanism for urging the valve is provided, and the load increasing mechanism brings one end of a link pivotally supported by a fixing member into contact with the reciprocating air piston, and the intermediate portion of the link is the valve body. It is characterized in that the load on the air piston is increased and transmitted to the valve body by the principle of leverage by abutting on the load transmission member for transmitting the load to the air piston . And, by having such a structure, the pressure of the highly viscous fluid can be surely lowered by a simple structure.

The pressure reducing valve device of the present invention according to claim 2 is characterized in that at least one of the above links is provided. By having such a configuration, if the principle of leverage is performed by a plurality of sets of links, the air pressure can be increased more stably.

According to the pressure reducing valve device of the present invention, the pressure of a highly viscous fluid can be reliably reduced by using air pressure in spite of its small size and simple structure by the principle of leverage.

Therefore, when the air pressure of the air supplied from the air supply port 30 acts on the upper surface of the air piston 32, the air piston 32 is lowered by this air pressure, and as a result, each link 39 is in the horizontal direction about the pin 40. It is swung so as to approach. Then, the pin 42 of each link 39 presses the load transmission member 34. At this time, since the distance from the pin 42 pressing the load transmission member 34 to the pin 40 is smaller than the distance from each roller 41 to which the air piston 32 is in pressure contact to the pin 40 forming the fulcrum. According to the principle of leverage, the load that the pin 42 of each link 39 presses on the load transmission member 34 is larger than the air pressure of the air supplied from the air supply port 30. For example, if the distance is 1/2, the load will be doubled. That is, the load generated by the air pressure of the air supplied from the air supply port 30 is increased.

As described above, according to the present embodiment, despite the simple configuration in which the link 39 for forming the principle of leverage is interposed between the air piston 32 and the load transmitting member 34, it is generated by pneumatic pressure. The load applied can be stably increased to satisfactorily reduce the pressure of the viscous fluid.

Claims (4)

A pressure reducing valve device that decompresses and supplies a highly viscous fluid, and is equipped with an air pressure supply path that supplies air pressure that operates the valve body of the valve that opens and closes the flow path in a direction away from the valve seat. ,
A pressure reducing valve device provided with an air pressure increasing mechanism for increasing the air pressure that amplifies the load generated in the air piston moved by the air pressure supplied from the air pressure supply path and urges the valve in the opening direction. .. In the air pressure increasing mechanism, one end of a link pivotally supported by a fixing member is brought into contact with a reciprocating piston, and an intermediate portion of the link is brought into contact with a load transmitting member that transmits a load to the valve body. The pressure reducing valve device according to claim 1, wherein the load on the piston is increased and transmitted to the valve body by the principle of leverage. The pressure reducing valve device according to claim 2, wherein at least one of the links is provided. The air pressure increasing mechanism includes a piston rod having a diameter smaller than that of the piston that is connected to and driven by a reciprocating piston, and a liquid having a diameter larger than that of the piston rod and being filled in a closed space in conjunction with the piston rod. The first aspect of the present invention is characterized in that the piston has a hydraulic piston for pressing the piston, and the load on the piston is increased and transmitted to the valve body via the hydraulic piston by the principle of Pascal. Pressure reducing valve device.

Images